Upconversion luminescence of the Er3+ and Yb3+ codoped transparent vitroceramics

The upconversion luminescence of oxyfluoride transparent vitroceramics codo ped with Er3+ and Yb3+ has been studied experimentally. There are microcrys tallites to form in the oxyfluoride glass which is treated over its transit ion temperature, and the transparent vitroceramics are obtained. The vitroc eramics has the better transparency and a high upconversion luminescent eff iciency. Our results show that there is strong energy transfer between Er3 and Yb3+ in the vitroceramics, which results in the change of the upconver sion spectra with intensity of excitation laser.